function getStyle(obj,name)
    {
    if(obj.currentStyle)
    {
        return obj.currentStyle[name];
    }
    else
    {
        return getComputedStyle(obj,false)[name];
    }
}
var timer = null;
function starMove(obj,json,fnEnd){
    clearInterval(obj.timer);
    obj.timer=setInterval(function (){
        var bStop=true;// 假设所有的值都到了

        for(var attr in json){
            var cur=0;
            if(attr=='opacity'){
                cur=Math.round(parseFloat(getStyle(obj,attr))*100);
            }else{
                cur=parseInt(getStyle(obj,attr));
            }
            var speed=(json[attr]-cur)/6;
            speed=speed>0?Math.ceil(speed):Math.floor(speed);
            if(cur!=json[attr]){
                bStop=false;
            }
            if(attr=='opacity'){
                obj.style.filter='alpha(opacity:'+(cur+speed)+')';
                obj.style.opacity=(cur+speed)/100;
            }else{
                obj.style[attr]=cur+speed+'px';
            }
        }
        if(bStop){
            clearInterval(obj.timer);
            if(fnEnd)fnEnd()
        }
    },30)
}